3Com 3C13636 Configuration Manual page 890

3Com Router 3000 Ethernet Family
Configuration Guide
Caution:
The configured value will not take effect unit the command reset ospf is executed.
Table 3-21 Configure tag for redistributed VPN route
Configure tag for an redistributed VPN route
Restore the default value
By default, the first two characters of tag-number are fixed to 0xD000 and the last two
ones are the AS number of the local BGP. For example, if the local BGP AS number is
100, the tag value in decimal is 3489661028. Tag-number is in range of 0~4294967295.
2) Configuring Multi-VPN-Instance CE
You may configure OSPF multi-instance to isolate the services of different VPNs.
After binding an OSPF process with a VPN instance on a CE router, you must configure
the following command in OSPF view.
Table 3-22 Configure a router as multi-VPN-instance CE
Configure a router as multi-VPN-instance CE
Remove the configuration
3) Configuring a Sham-Link
Sham links are required between two CEs when backdoor links are set up between the
two PEs and service data is expected to be transmitted over MPLS backbone. A sham
link between two PEs is considered as a link in OSPF domain. Its source and
destination addresses are both the loopback interface address with 32-bit mask, but
this loopback interface should be bound to a VPN instance and directly connected
routes must be redistributed to BGP.
Perform the following configuration in OSPF domain view.
Table 3-23 Configure a sham-link
Operation
Configure a sham-link
Operation
Operation
sham-link
cost-value ] [ simple password | md5 keyid key ] [ dead
seconds ] [ hello seconds ] [ retransmit seconds ]
[ trans-delay seconds ]
3Com Corporation
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Chapter 3 BGP/MPLS VPN Configuration
Command
route-tag tag-number
undo route-tag
Command
vpn-instance-capability simple
undo vpn-instance-capability
Command
source-addr destination-addr [ cost